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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Brackett line | 
| Brackett line comparison table | |||||||||||
| Subject | has lower energy level | has specie | has equivalent width | has unit | has value | occurs in | has series limit | has wavelength | has transition | has width | is an instance of | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| Br alpha | 4 | hydrogen (H I) | radiation unit | 40512 Å | Brackett line | 
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